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In the 1930s, several nations began to investigate fluoride's negative effects and how best to remove it. An aluminum and sand filter that removes fluorine from water was devised by Dr. S. P. Kramer in 1933; in 1945, M. Kenneth received a French patent for a water defluoridation technique; and in 1952, a functioning activated alumina community ...
Water purification
Experts eventually discovered that the water in Colorado Springs had unusually high levels of fluoride — up to 12 milligrams per liter. Fluoride is a mineral found naturally in rocks, which then ...
Purified water - Wikipedia ... Purified water
Ceramic water filter
Water fluoridation
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